1311191 has 6 divisors (see below), whose sum is σ = 1525320. Its totient is φ = 1123836.

The previous prime is 1311181. The next prime is 1311217. The reversal of 1311191 is 1911131.

It is not a de Polignac number, because 1311191 - 2⁶ = 1311127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13331 + ... + 13428.

It is an arithmetic number, because the mean of its divisors is an integer number (254220).

2^1311191 is an apocalyptic number.

1311191 is a deficient number, since it is larger than the sum of its proper divisors (214129).

1311191 is an equidigital number, since it uses as much as digits as its factorization.

1311191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26773 (or 26766 counting only the distinct ones).

The product of its digits is 27, while the sum is 17.

The square root of 1311191 is about 1145.0724867885. The cubic root of 1311191 is about 109.4515677198.

The spelling of 1311191 in words is "one million, three hundred eleven thousand, one hundred ninety-one".